I'm not too sure but in my head the Nacton blue, that is the light blue that came out first, should be on trailer ploughs, Robins and the cast Major hydraulic ploughs. And the Orwell blue, which came out later when the factory moved to Orwell, should be on any ploughs made after TS59's. Oh and TS 59's in my opinion should be the Orwell blue. As for the red or orange wheels I say "I'm not opening another tin of paint just to paint a wheel!". To be honest I haven't a clue about the orange wheels nor the blue paint. All I know is the Nacton blue came out first so it would have definitely been on trailed ploughs.

Lots of guys have their Ransomes ploughs painted this colour. I know mine are. As Bruce Almighty said earlier Fordson Empire Blue. Ford blue is a slightly different shade, as is Orwell blue
Bit like the “What colour should Fordson Major grilles be?” As not all the wheels were painted orange. Some were blue. For the orange ones I always used to use Howard Rotavator Orange.